//
//  SDCore.m
//  Spacedrive
//
//  This file will not work unless ARC is disabled. Do this by setting the compiler flag '-fno-objc-arc' on this file in Settings > Build Phases > Compile Sources.
//  This file also expects the Spacedrive Rust library to be linked in Settings > Build Phases > Link Binary with Libraries. This is the crude way, you should link the core with custom linker flags so that you can do it conditonally based on target OS.
//  This file also expects a Build Phase to be setup which compiles the Rust prior to linking the sdcore library to the IOS build.
//  This file also expects you to add "remote-notification" to the list of your supported UIBackgroundModes in your Info.plist
//
//  Created by Oscar Beaumont on 9/8/2022.
//

#import "SDCore.h"
#import <React/RCTLog.h>

// is a function defined in Rust which starts a listener for Rust events.
void register_core_event_listener(id objc_class);

// is a function defined in Rust which is responsible for handling messages from the frontend.
void sd_core_msg(const char* query, void* resolve);

// is called by Rust to determine the base directory to store data in. This is only done when initialising the Node.
const char* get_data_directory(void)
{
  NSArray *dirPaths = dirPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,
                                                                     NSUserDomainMask, YES);
  const char *docDir = [ [dirPaths objectAtIndex:0] UTF8String];
  return docDir;
}

// is called by Rust with a void* to the resolve function (of type RCTPromiseResolveBlock) to call it.
// Due to 'RCTPromiseResolveBlock' being an Objective-C block it is hard to call from Rust.
void call_resolve(void *resolvePtr, const char* resultRaw)
{
  RCTPromiseResolveBlock resolve = (__bridge RCTPromiseResolveBlock) resolvePtr;
  NSString *result = [NSString stringWithUTF8String:resultRaw];
  resolve(result);
  [result release];
}

@implementation SDCore
{
  bool registeredWithRust;
  bool hasListeners;
}

-(void)startObserving {
  if (!registeredWithRust)
  {
    register_core_event_listener(self);
    registeredWithRust = true;
  }
  
  hasListeners = YES;
}

-(void)stopObserving {
  hasListeners = NO;
}

- (void)sendCoreEvent: (NSString*)query  {
  if (hasListeners) {
    [self sendEventWithName:@"SDCoreEvent" body:query];
  }
}

- (NSArray<NSString *> *)supportedEvents {
  return @[@"SDCoreEvent"];
}

RCT_EXPORT_MODULE();

RCT_EXPORT_METHOD(sd_core_msg: (NSString *)queryRaw
                  resolver:(RCTPromiseResolveBlock)resolve
                  rejecter:(RCTPromiseRejectBlock)reject)
{
  const char *query = [queryRaw UTF8String];
  sd_core_msg(query, (__bridge void*) [resolve retain]);
}

@end